[llvm-bugs] [Bug 48558] New: using-directive injects names into wrong namespace scope

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48558

            Bug ID: 48558
           Summary: using-directive injects names into wrong namespace
                    scope
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: arthur.j.odwyer at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

// https://godbolt.org/z/8bEMfW

struct Cat {};
struct Lion : Cat {};

namespace Outer {
    namespace Inner {
        namespace N1 {
            int foo(Cat);
        }
        namespace N2 {
            int test();
        }
    }

    int foo(Lion);

    int Inner::N2::test() {
        using namespace Inner::N1;
        return (foo)(Lion());
    }
}

When Clang sees the using-directive, it seems to insert a declaration of
Outer::Inner::N1::foo(Cat) into the lowest-common-ancestor namespace of Outer
(where the definition of `Inner::N2::test()` appears) and Outer::Inner::N1.
However, it SHOULD insert the declaration into the lowest-common-ancestor
namespace of Outer::Inner::N2 (where the original declaration of `test()`
appeared) and Outer::Inner::N1.

The parens in `(foo)(Lion())` are just there to turn off ADL to simplify the
example; they're not relevant to the bug.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20201219/d42a50b1/attachment.html>